DB in Simple recovery mode + disk setup

If you have 4 disks available (on a controller with 2 channels) and you know you will host databases that are in Simple Recovey mode only on the server (with a lot of reads and writes, 60% read 40% write) would you:

1. Still seperate Data and Log on different channels as 2 x RAID1

2. Or would you set it up as 1 x RAID0+1

Currently this system is running on on single RAID1 and with a writelog waitstats percent of 73% causing a lot of CPU spikes.